2) The figure below shows a circuit made of a thermistor and a fixed resistor R2. The resistance – temperature characteristic of the thermistor is given in the graph. The output voltage Vo should be 2V when the temperature is 2°C. i) ii) Calculate the value of the fixed resistor R2. What is the output voltage when the temperature of the thermistor is 24°C?

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.